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Matthieu Baerts (NGI0) 3c7dafc171 mptcp: pm: fix backup support in signal endpoints 
commit 6834097fc3 upstream.

There was a support for signal endpoints, but only when the endpoint's
flag was changed during a connection. If an endpoint with the signal and
backup was already present, the MP_JOIN reply was not containing the
backup flag as expected.

That's confusing to have this inconsistent behaviour. On the other hand,
the infrastructure to set the backup flag in the SYN + ACK + MP_JOIN was
already there, it was just never set before. Now when requesting the
local ID from the path-manager, the backup status is also requested.

Note that when the userspace PM is used, the backup flag can be set if
the local address was already used before with a backup flag, e.g. if
the address was announced with the 'backup' flag, or a subflow was
created with the 'backup' flag.

Fixes: 4596a2c1b7 ("mptcp: allow creating non-backup subflows")
Cc: stable@vger.kernel.org
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/507
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
[ Conflicts in pm_userspace.c because the context has changed in commit
  1e07938e29 ("net: mptcp: rename netlink handlers to
  mptcp_pm_nl_<blah>_{doit,dumpit}") which is not in this version. This
  commit is unrelated to this modification.
  Conflicts in protocol.h because the context has changed in commit
  9ae7846c4b ("mptcp: dump addrs in userspace pm list") which is not
  in this version. This commit is unrelated to this modification.
  Conflicts in pm.c because the context has changed in commit
  f40be0db0b ("mptcp: unify pm get_flags_and_ifindex_by_id") which is
  not in this version. This commit is unrelated to this modification.
  Conflicts in subflow.c, because the commit 4cf86ae84c ("mptcp:
  strict local address ID selection") is not in this version. It is then
  not needed to modify the subflow_chk_local_id() helper, which is not
  in this version.
  Also, in this version, there is no pm_userspace.c, because this PM has
  been added in v5.19, which also causes conflicts in protocol.h, and
  pm_netlink.c. Plus the code in pm.c can be simplified, as there is no
  userspace PM. And the code in pm_netlink.c needs to use
  addresses_equal() instead of mptcp_addresses_equal(), see commit
  4638de5aef ("mptcp: handle local addrs announced by userspace PMs").
  The code in pm_netlink.c also needs to be adapted because the
  pm_nl_get_pernet_from_msk() helper is not in this version, introduced
  later in commit c682bf536c ("mptcp: add pm_nl_pernet helpers"). ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-19 05:45:48 +02:00
arch x86/mtrr: Check if fixed MTRRs exist before saving them 2024-08-19 05:45:47 +02:00
block block: initialize integrity buffer to zero before writing it to media 2024-08-19 05:44:50 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: aead,cipher - zeroize key buffer after use 2024-07-18 13:07:27 +02:00
Documentation clocksource: Scale the watchdog read retries automatically 2024-08-19 05:45:45 +02:00
drivers drm/mgag200: Set DDC timeout in milliseconds 2024-08-19 05:45:47 +02:00
fs ext4: fix wrong unit use in ext4_mb_find_by_goal 2024-08-19 05:45:39 +02:00
include mptcp: sched: check both directions for backup 2024-08-19 05:45:47 +02:00
init init/main.c: Fix potential static_command_line memory overflow 2024-04-27 17:05:28 +02:00
io_uring io_uring/io-wq: limit retrying worker initialisation 2024-08-19 05:45:22 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel sched/smt: Fix unbalance sched_smt_present dec/inc 2024-08-19 05:45:47 +02:00
lib kobject_uevent: Fix OOB access within zap_modalias_env() 2024-08-19 05:45:17 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/numa_balancing: teach mpol_to_str about the balancing mode 2024-08-19 05:45:17 +02:00
net mptcp: pm: fix backup support in signal endpoints 2024-08-19 05:45:48 +02:00
samples Add gitignore file for samples/fanotify/ subdirectory 2024-07-27 10:46:16 +02:00
scripts kbuild: Fix '-S -c' in x86 stack protector scripts 2024-08-19 05:45:16 +02:00
security apparmor: Fix null pointer deref when receiving skb during sock creation 2024-08-19 05:45:25 +02:00
sound ALSA: hda/hdmi: Yet more pin fix for HP EliteDesk 800 G4 2024-08-19 05:45:43 +02:00
tools clocksource: Scale the watchdog read retries automatically 2024-08-19 05:45:45 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-10 16:18:34 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
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.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
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COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS trace: Relocate event helper files 2024-04-10 16:19:24 +02:00
Makefile Linux 5.15.164 2024-07-27 10:46:18 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.